package com.dawn.seckilldemo.controller;

import com.dawn.seckilldemo.pojo.User;
import com.dawn.seckilldemo.service.GoodsService;
import com.dawn.seckilldemo.service.UserService;
import com.dawn.seckilldemo.vo.GoodsVo;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.thymeleaf.context.WebContext;
import org.thymeleaf.spring5.view.ThymeleafViewResolver;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Date;
import java.util.concurrent.TimeUnit;

@Controller
@RequestMapping("/goods")
public class GoodsController {
    @Autowired
    private UserService userService;

    @Autowired
    private GoodsService goodsService;

    @Autowired
    private RedisTemplate redisTemplate;

    //手动渲染
    @Autowired
    private ThymeleafViewResolver thymeleafViewResolver;

    //跳转到商品列表页
    @RequestMapping(value = "/toList",produces = "text/html;charset=utf-8")
    @ResponseBody//使用了redis缓存页面需要添加
    public String toList(Model model, User user,
                         HttpServletRequest request, HttpServletResponse response){
        //这个地方使用mvc进行优化,避免每次都要判断
       /* if(StringUtils.isEmpty(ticket)){
            return "login";
        }
//        User user = (User) session.getAttribute(ticket);
        //重新从redis获取用户信息
        User user = userService.getUserByCookie(ticket, request, response);
        */
        //redis中获取页面，如果不为空，直接返回页面
        ValueOperations valueOperations = redisTemplate.opsForValue();
        String html = (String) valueOperations.get("goodsList");
        if(!StringUtils.isEmpty(html)){
            return html;
        }

        if(user==null){
            return "login";
        }
        model.addAttribute("user",user);
        //展示商品
        model.addAttribute("goodsList",goodsService.findGoodsVo());
//        return "goodsList";

        //如果为null，手动渲染，存入redis中
        WebContext webContext = new WebContext(request,response,request.getServletContext()
                ,request.getLocale(),model.asMap());
         html = thymeleafViewResolver.getTemplateEngine().process("goodsList", webContext);
        if(!StringUtils.isEmpty(html)){
            valueOperations.set("goodsList",html,60, TimeUnit.SECONDS);
        }
        return html;
    }

    //跳转商品详情页面
    @RequestMapping(value = "/toDetail/{goodsId}",produces = "text/html;charset=utf-8")
    @ResponseBody
    public String toDetail(Model model, User user, @PathVariable Long goodsId,
                           HttpServletRequest request,HttpServletResponse response){
        //使用页面缓存
        ValueOperations valueOperations = redisTemplate.opsForValue();
        String html = (String) valueOperations.get("goodsDetail:" + goodsId);
        if(!StringUtils.isEmpty(html)){
            return html;
        }

        model.addAttribute("user",user);
        GoodsVo goodsVo = goodsService.findGoodsVoByGoodsId(goodsId);
        Date startDate = goodsVo.getStartDate();
        Date endDate = goodsVo.getEndDate();
        Date nowDate = new Date();
        //秒杀状态
        int secKillStatus = 0;
        //秒杀倒计时
        int remainSeconds = 0;
        if(nowDate.before(startDate)){
            //秒杀还没有开始
            remainSeconds = (int) ((startDate.getTime()-nowDate.getTime())/1000);
        }else if(nowDate.after(endDate)){
            //秒杀结束
            secKillStatus =2;
            remainSeconds = -1;
        }else {
            //秒杀进行中
            secKillStatus = 1;
            remainSeconds = 0;
        }

        model.addAttribute("secKillStatus",secKillStatus);
        model.addAttribute("remainSeconds",remainSeconds);
        model.addAttribute("goods",goodsVo);

        //如果为null，手动渲染，存入redis中
        WebContext webContext = new WebContext(request,response,request.getServletContext()
                ,request.getLocale(),model.asMap());
        html = thymeleafViewResolver.getTemplateEngine().process("goodsDetail", webContext);
        if(!StringUtils.isEmpty(html)){
            valueOperations.set("goodsDetail:"+goodsId,html,60, TimeUnit.SECONDS);
        }
        return html;
//        return "goodsDetail";
    }
}
